How to choose your window sill or sunscreen window shades? What is the difference between a concrete window sill and a prefabricated window sill? Finally, how to put a window sill yourself or prefabricated?
Principle of a window sill
The installation of a sunscreen window shades is essential to ensure a good water and airtightness of the house facade. A window sill allows the flow of rainwater at the joinery of the house through its sloping design.
A window sill consists of a slope, a rejingot, a nose often rounded and a drop of water. Window sills are also known as window sills or window sills. They are found in various materials, most often in concrete, but also in aluminum, PVC or stone.
Choose window threshold
The installation of a windowsill is done before the installation of the window. From there, two solutions are available to you. Either you decide to make your window sill by pouring concrete or you put a prefabricated window sill.
Concrete window sills
A window sill can be done by your own means, this involves pouring concrete. We advise you to opt for this type of window sill if you are a skilled handyman. Indeed, the good sealing of the window is at stake.
To cast a concrete window sill, the realization of a formwork according to the dimensions of the window is essential.
The casting of a window sill is the most economical but more complex to implement. For simplicity in installing a window sill, you can choose a prefabricated sunscreen window shades.
Prefabricated window sills
The prefabricated window sills can be found in your DIY stores such as Leroy Merlin, Brico Depot or Castorama. These window sills are ready to install and have all the features to ensure the water tightness of your window thanks to its rear and side rejingots that prevent upwelling in the masonry. In addition, the concrete is waterproofed in the mass.
- The price of prefabricated window sills will depend on various factors like:
- The dimensions of the window support ready to pose.
- Window support materials: concrete, concrete resin, reconstituted stone, terracotta.
- The color and finish of the window sill: in gray, in white and even in stone
- For a prefabricated window sill, expect a budget of between 40 and 80 euros, all taxes included.
The advantage of prefabricated window sills is numerous. Moreover, we advise you if your window is of standard size to choose these types of window sills. Indeed, they are very easy to install compared to custom window sills. The prefabricated supports offer a real time saving and a perfect job since you do not have to realize the formwork.
How to put a concrete window sill?
To properly install a concrete window sill, there are two main steps to follow:
The preparation of a wooden formwork.
We advise you to place a window sill with custom formwork yourself, if and only if your carpentry is made to measure. Indeed, to realize the formwork and to pour the concrete of a support of window is long and complicated.
So, if your window dimensions are standard, we strongly advise you to choose a prefabricated window sill because the installation is much easier and within the reach of all.
Prepare the formwork of the window support
The first step before pouring the concrete from your window sill is the preparation of the wooden formwork.
Take wooden boards the length of the opening + 5 cm on each side. Position the planks on both sides of the wall to create the wooden formwork. For the height of the boards, it is advisable to raise them up to the final height of the rejingot of the support of window. Fasten wooden planks with joined greenhouses while checking horizontal and lateral levels
Once the formwork is perfectly in place, you must pour the concrete carefully. Here are the steps to follow to have a concrete window sill:
Apply oil to the formwork and spoil a first layer of firm concrete 20 mm minimum.
Fill your support with standard concrete (350 kg / m3), you can apply it even before the concrete has dried. This is the inside of the window sill, better known as the core. It is important to pack the concrete well to chase the air.
Using a small board, level the concrete and make your slope of window sill.
To build your rejingot which is essential for the waterproofness of the joinery, it is necessary to position a cleat at the level of the slope and the wooden board back. Once the cleat is properly positioned, coat with firm mortar and smooth with a trowel. Once the mortar begins to dry, you can remove the cleat.
For the groove of the window sill must be done to the mortar. There is no need for formwork for this step, simply rub mortar that you will round to your liking.
Finish laying the window sill
At first, before disassembling the whole, it is necessary to humidify the work.
Check the level and height of your rejingot . If necessary iron a shot of concrete so that it is level.
When the window sill is operational, you can now go to the formwork. You can break down your window sill once the concrete is dry, allow at least 24 hours after pouring the concrete.